- ??? ????(????? ??)???? ?? ????????? ?? ???? ??.If a grammatical principle that is certainly added to ????is usually a vowel ??and there's no other choice in addition to a vowel ??then that grammatical principle can not be additional to ???? ?????? ????????, ?? ??????, ?? ??, ?????? ?? ??????????????.??????(??)??: ???????? ???????????? ??·?????